汇编语言统计输入中各字符出现的次数

DATA SEGMENT
BUFFER DB 100
DB ?
DB 100 DUP(?)
CHARS DB 'INPUT:$'
DATA ENDS
CODE SEGMENT
     ASSUME CS:CODE,DS:DATA
MAIN PROC FAR
     PUSH DS
     SUB AX,AX
     PUSH AX
     MOV AX,DATA
     MOV DS,AX
START: MOV DX,OFFSET CHARS
     MOV AH,9
     INT 21H
     MOV DX,OFFSET BUFFER
     MOV AH,0AH
     INT 21H
     MOV DL,0AH
     MOV AH,2
     INT 21H
     MOV DL,0DH
     MOV AH,2
     INT 21H
     MOV SI,OFFSET BUFFER
     INC SI
     MOV AL,[SI]
     INC SI
     MOV DL,[SI]
     MOV DH,[SI]
     MOV DI,SI
     MOV CL,AL
     MOV CH,0
     MOV BL,1
     MOV BH,0
     DEC CL
GO1: INC SI
     CMP DL,[SI]
     JNE TO1
     INC BL
TO1: LOOP GO1
     CALL OUTPUT
     MOV BL,1
TO5: INC DI
     DEC AL
     CMP AL,1
     JE TO3
     CMP DH,[DI]
     JE TO5
     MOV DL,[DI]
     MOV SI,DI
     MOV CL,AL
     MOV CH,0
     DEC CL
GO2: INC SI
     CMP [SI],DL
     JNE TO2
     INC BL
     MOV [SI],DH
TO2: LOOP GO2
     CALL OUTPUT
     MOV BL,1
     JMP TO5

TO3: CMP DH,[DI]
     JE TO4
     MOV DL,[DI]
     MOV BL,1
     CALL OUTPUT
TO4: RET
MAIN ENDP

;?-------------------------
OUTPUT PROC
     PUSH AX

     PUSH CX
     PUSHF
     MOV AH,2
     INT 21H
     MOV DL,20H
     MOV AH,2
     INT 21H
     MOV AL,BL
     MOV AH,0
     MOV CL,10
     DIV CL
     ADD AH,30H
     ADD AL,30H
     MOV CH,AH
     MOV DL,AL
     MOV AH,2
     INT 21H
     MOV DL,CH
     MOV AH,2
     INT 21H
     MOV DL,0AH
     MOV AH,2
     INT 21H
     MOV DL,0DH
     MOV AH,2
     INT 21H
     POPF
     POP CX
     POP AX
     RET
OUTPUT ENDP
CODE ENDS
    END MAIN

;?-----------------

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